on whiteYour hand, rebuilt so it survives at every size. The background, the drop shadow and the light burst are gone. The light is now one red dot in the brand accent.
Transparent background, so it sits on anything.
on whiteThis is real pixels, not a mock-up. The one on the left is what sits in a browser tab.
Roughly what you will see at the top of the window. It is also the icon if someone saves the site to a phone home screen.